Embedded Systems Conference
Breaking News
Comments
Newest First | Oldest First | Threaded View
davtu
User Rank
Author
Re: Converter
davtu   7/30/2013 12:54:21 PM
NO RATINGS
The devices that you listed allows the controller to use RS-232 via the PCI or PCIE bus. This still does not solve the problem of how to to get RS-232 to converse with a USB device. My point is that the converter needs to have the right USB protocols in order to talk to the DMM on the device side. RS-232/USB converters work because they communicate easily to the USB controller since the drivers work with any PC. However, on the device side you need unique drivers for every type of USB device.

The suggestion in your blog post was to use a RS-232/USB converter to talk to the new 34461A which I don't believe is possible. However, a RS-232/USB converter would work quite well with the 34401A.


Perhaps we can take this offline, once we come to an agreement we can update the comments section.

MeasurementBlues
User Rank
Author
Re: Converter
MeasurementBlues   7/30/2013 12:29:37 PM
NO RATINGS
If the instrument and the controller both have USB, of course that's what you'd use. But, older instruments such as the 34401A were designed before USB and it was never added. Tha started with the 34405A/34410A/34411A series a few years ago.

See The Serial Port: It Just Keeps Going for several types of interfaces that add serial ports to computers and controllers.

davtu
User Rank
Author
Re: Converter
davtu   7/30/2013 12:23:19 PM
NO RATINGS
I'm not sure that I understand how a RS-232/USB converter could be used in that case. RS-232 can only talk to one device at a time. How would a system with multiple IO's use the converter? If they have USB, wouldn't they just use USB? Not trying to be snarky, I'd really like to understand how to get this to work.

MeasurementBlues
User Rank
Author
Re: Converter
MeasurementBlues   7/30/2013 12:16:20 PM
NO RATINGS
>An RS-232 to USB converter won't work with the DMM.

That's true if your controller has the RS-232 port and the Meter has USB only. But, many automated test systems use more than one communications bus, for that reason.

davtu
User Rank
Author
Converter
davtu   7/30/2013 12:13:42 PM
NO RATINGS
An RS-232 to USB converter won't work with the DMM. Normally those converters connect the USB side to the controller while the RS-232 connnects to the device. For those that need RS-232, it is usually the controller that has RS-232; while the device (DMM) is USB. This is difficult for converters since they need to have the proper USB drivers to talk to the DMM. There aren't many (if any) of those out there.


A better method is to use RS-232 to Ethernet converters. I did a write up on a blog for this: http://gpete-neil.blogspot.com/2013/07/rs232-to-control-lxi-instruments.html

 

 

MeasurementBlues
User Rank
Author
Another versionb of this story.
MeasurementBlues   7/9/2013 4:39:33 PM
NO RATINGS
See What! They're Replacing My Meter? at DesignCon Community.

MeasurementBlues
User Rank
Author
Final 34401A purchase
MeasurementBlues   7/9/2013 4:37:05 PM
NO RATINGS
I imagine some large defense companies with many test systems in house will buy many 34401A meters because they are convinced that there are alwasy differences that can mess up their test results.

MeasurementBlues
User Rank
Author
Re: new version is better
MeasurementBlues   7/9/2013 4:36:36 PM
NO RATINGS
>I rather like that new screen they are using

It looks like a nice display. Agilent has been using that type of display in several other products.

 

B_Albing
User Rank
Author
new version is better
B_Albing   7/9/2013 2:03:47 PM
NO RATINGS
Martin, I rather like that new screen they are using - makes an instrument that is sort of like a bare-bones 'scope. I think I'll go with the new version.



Radio
NEXT UPCOMING BROADCAST
In conjunction with unveiling of EE Times’ Silicon 60 list, journalist & Silicon 60 researcher Peter Clarke hosts a conversation on startups in the electronics industry. One of Silicon Valley's great contributions to the world has been the demonstration of how the application of entrepreneurship and venture capital to electronics and semiconductor hardware can create wealth with developments in semiconductors, displays, design automation, MEMS and across the breadth of hardware developments. But in recent years concerns have been raised that traditional venture capital has turned its back on hardware-related startups in favor of software and Internet applications and services. Panelists from incubators join Peter Clarke in debate.
Flash Poll
Top Comments of the Week
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Special Video Section
The LTC®4015 is a complete synchronous buck controller/ ...
10:35
The LT®3042 is a high performance low dropout linear ...
Chwan-Jye Foo (C.J Foo), product marketing manager for ...
The LT®3752/LT3752-1 are current mode PWM controllers ...
LED lighting is an important feature in today’s and future ...
Active balancing of series connected battery stacks exists ...
After a four-year absence, Infineon returns to Mobile World ...
A laptop’s 65-watt adapter can be made 6 times smaller and ...
An industry network should have device and data security at ...
The LTC2975 is a four-channel PMBus Power System Manager ...
In this video, a new high speed CMOS output comparator ...
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...